package com.itheima.day07_Object_oriented_fundamentals;

public class Demo3_test {
    public static void main(String[] args) {
        Student s1 = new Student();
        Student s2 = new Student("张三", 80, 90);
        Student s3 = new Student();
        s3.setAge(90);
        System.out.println("s3.getAge() = " + s3.getAge());
    }
}
